/* 基本选择器：id选择器、class选择器、标签选择器 */
/* 重置样式 */
* {
    margin: 0;
    padding: 0;
}
a {
    text-decoration: none;
}
header{
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    /* background-color: #ccc; */
    color: #fff;
}
nav a{
    margin: 0 20px;
    color: #000;
    font-size: 20px;
}
nav {
    /* margin: 0 50px; */
    /* margin: 0 100px 0 50px; */
}
main{
    height: 600px;
    background: url(images/main-bg.png);
}
.main-container{
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
}
aside{
    width: 15%;
    background-color: #ccc;
    padding: 10px;
}
footer{ 
    background-color: #000;
    color: #fff;
}